Dental appliance.



JGJYOZZZYgSWOVZ/I/ 'J. G. HOLLINGSWORTH.

DENTAL APPLIANCE. AAAAAAA TION TIL-ED AUG. 29, 1913.

1 ;101,439. Patented June 23,1914.

G. HOLL INGSWORTH. DENTAL APPLIANCE.

APPLICATION FILED AUG. 29, 19-13.

Patented June 23, 1914.

2 SHEET8-SHEET 2.

mum-53m I JEPTHA G. HOLLINGSW'ORTI-I, OF KANSAS CITY, MISSOURI.

DENTAL APPLIANCE.

Specification of Letters Patent.

Application filed August 29, 1913.

Patented June 23, 1914.. Serial No. 787,356.

To all whom it may concern:

Be it known that I, J EPTHA G. HOLLINGS- WORTH, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Dental Appliances, of which the following is a specification.

This invention relates to a dental appliance for use in the preparation of fillings, such as described in my application for patent for method of preparing'dental fillings, filed February 21, 1914, and my object is to provide a device by means of which gold leaf and enamel fillings may be prepared by cold process entirely outside the mouth of the patient ready to be inserted in the tooth cavity and secured in place by cement, thereby eliminating the pain and discomfort incident to the usual filling operations when performed in the mouth.

To this end my invention comprises a holder for receiving a matrix which has been prepared from an impression of the tooth cavity, and means for clamping the filling material about the matrix while being molded therein, provision being made forrall requisite adjustments between the holder and clamping means. In the case of amalgam or other plastic fillings, the clamping means includes a strip or band of pliable transparent material for engaging the filling material as well as holding it under pressure and receiving the contact of the tools whereby the filling material is worked into the matrix, so that any possibility of the filling being marred or tarnished by chemical action sometimes resulting from contact of the filling material with metallic substances is avoided, and the transparency of the clamping band enables the operator to observe and follow closely the outlines of the work.

Having these objects in view, the invention resides in certain peculiar and novel features of construction as hereinafter described and particularly pointed out in the appended claims; and to afiord a full and clear understandingthereof, reference will be had to the accompanying drawings, forming a part of this specification, and in which Figure 1 is a side elevation, partly in vertical section, of the device as arranged for cold gold fillings; Fig 2, is a frontelevation of the same; Fig. 3, is a section along the line IIIIII of Fig. 1, looking in the direction of the arrow; Fig. 4, is a front elevation of the device as arranged for plastic or amalgam fillings; Fig. 5, is

a side view of the device provided with a slightly modified form of clamping attachment; Fig. 6, is a bottom plan view of said clamping attachment the clamping band being omitted; Figs. 7 and 8 are side and plan views respectively, showing another form of clamping attachment.

Referring to the drawings, the base portion 2 of the device is provided with a central socket 4 into which is threaded the shank portion 6 of a matrix holding plug 8, provided with a top recess 12. The recess is slightly undercut, as shown in Fig. 1, and provided with a bottom channel 14, in order to receive and look within the top of said plug a bed 16 of sealing wax on which to mount the cement matrix 18.

Adapted to embrace the shank portion 6 of the plug 8, is a clamping yoke 20, having resilient arms normally in loose sliding engagement with the shank 6. Through the extremities of said yoke arms extends a bolt 22, said bolt sliding freely through one of said extremities and threaded to engage the other extremity and thereby draw said yoke arms together into clamping engagement with said shank portion 6. The arrangement is such that the yoke is adjustable in any horizontal direction upon the shank of said plug. The yoke carries at one end an angular arm 24, the upper end of which extends parallelwith the yoke so as to overlie the wax bed 16 and matrix carried thereby. This upper end of said arm has threaded therethrough a clamping post 26, which may be adjusted into clamping engagement with the parts carried by the bed 16, as shown in Figs. 1 and 2. This use of the post is preferred in the preparation of cold gold fillings, inwhich process a wax impression is taken of the tooth cavity and embedded in quick setting cement to form the matrix 18. This matrix is then applied to the bed of hot wax 16, said bed being built up around the sides of the matrix and the wax impression withdrawn before it is melted by the heat from the bed 16. The bed 16 is then mounted in the top of the plug 8,and the pliant character of this bed, while it remains soft under the influence of heat, permits the cement matrix 18 to be preferred' The lower end of the post 26 may be readily setat any point on the bedl 16, and the angular supporting arm 24 permits easy access to the work and observa-' in the matrix tightly while it is being molded to the contour of the matrix, and at the} positioned. at any desired angle with reference to the bed to facilitate the carrying out 01": the filling operation. -When the bed has cooled and hardened, so as to retain be filled, the gold being condensed either "by hand, or mallet or engine burnisher, as

tion thereof from any angle.

In the case of plasticor' amalgam fillings it is desirable to clamp the filling material same time avoid any contact of the tools with the filling. accomplish this by clamp ingthe filling material means of a band Q or strip 28 of pliable transparent materiah such as celluloid, the central portion of which is disposed over the filling material and the ends of the'band secured preferably to ayoke 30 by means of buttons 32formed on the extremities of the yoke'and engaging eyes34 of the band. The lower end of the I 'post 26 is diametrically reduced at 36 to form a downwardly disposed shoulder 38 to bear upon the upper side of the central portion of the yoke 30", the reduced extremity 36 of'the post extending through the yoke to i hold the same in fixed relation to said shoulder38. By this means, upon the adjustment of the post the yoke will be brought down f to tighten the band about the filling material, the outline of which will at all times I owing to the'transparenoy of the band i be clearly discernible to the operator, who;

will thus be enabled to quickly work the'fill ing to the proper contour and without any contact of his instruments therewith.

modificati n of he clamping attach-f ment for plastic fillings is shown in' Figs 5 and 6, in which case the clamping band is made suilicientlylong to secure it to buttons 40 provided on the base portion' 2 of the device, and the"intermedia te portions of the; band are drawn'inward by resilient arms 42 1 carried by a pin 44 on one end of a. bar 46.

This bar is' provided with an opening 48 for receivingthe shank of 'thematrix holding plug8', whereby the bar may 'be clamped to the base2 as shown in Fig. 5. When so applied, the resilient arms 42, by pressing in "on 3 a the depending portions of the band 28, cause the latter, to be drawn tightlyaga-inst the filling and matrix, and the parts'are 'held' in this relation by the h0oked'ends50 of said arms being ,lockedtogether as shown.

. IhFigg and 8 1 h wthe cl mp n ai were w t la eme t? carried thereby.

retaining the ends thereof within open ended slots 54 in the ends of a yoke 56 which yoke. is carried by a stem 58 having a recess 60 for embracing the arm 24. A clamping screw 62 is provided for clamping said stem to said arm. The recess 60' is enlarged toward its bottomso that on tightening up the screw 62,.the yoke 56 will be'given ado-wnward movement acting toclamp the band 28 snugly over the bed 16 and the parts From the foregoing it will be apparent that I have devised a very simple, compact and etficient means for carrying out the objects of my invention, and while I haye'illustra ted and described what now appears to me to be the preferred forms of the same, I desire to reservethe right to any modificatio'n's th reof which my n11 within the spirit and scope of the'a ppended claims.

" I claim: 7 g

V 1. in an apparatus of the. character described, a matrix .holder',',a device for clamping the material to bemoldedto said matrix, and means for supporting: said deviceadjustably adjacent to the matrix 2. In an"app'aratus of the'character described, a matrix holder provided with a cementitious bed for receiving the maftrix, a device 'foriclamping the material to be molded to" said matrix, and means carried by said holder for supporting said device adjacent'to the matrix;

3'. In an apparatusv of the character described, a matrix'ho'lder having a'reduced stem portion, a devicefo-r clamping the materia-l tobe molded to said matrix, des vicebeing providedwith a clamping yoke for securing the device'to said stem portion.

4. In a dental appliance, a mzit-iixi'hold'er comprising a base portion'and'a top portion detach-ably secured to said base portion, said top portion being provided with a recess for receiving a cementitiousbed for the matrix. '5. In a dental appliance, a matrix holder comprising a base portion having'a socket, a top portionhaving astem fordetachably engaging saidsocket, and a; clampingmemf'or clamping the materi-alto be molded to said top'portion, saidmember being provided witha resilient clamping yoke for securing said member to said stem.

6. In a dental appliance, a matrix holder comprising a. base provided with a bed upon which to support the matrix, a yoke extending to the sides of saidbed, and carrying means for clamping the material to be mold ed to said matrix, and means for adjustably' securing'said yoke tos'aid base.

7. In a dental a pliance, a matrix holder comprising a base, provided with a bed upon which to sup' m the matrixj a pliable clamping band adapted to overlie said bed,

around said'bed.

and'n'ieans for; clamping said tightly 8. In a dental appliance, a matrix holder which to support the matrix, a pliable transcomprising a base provided with a bed upon parent clamping band adapted to overlie which to support the matrix, a pliable transsaid bed, and means for clamping said band parent clamping band adapted to overlie tightly about said bed.

5 said'bed, a yoke detachably engaging said In testimony whereof, I affix my signature, 15

band at its opposite ends, and means for in the presence of two witnesses.

adjusting said yoke and causing it to clamp J EPTHA Gr'. HOLLINGSWORTH. said band tightly about said bed. Witnesses: V 9. In a dental appliance, a matrix holder, HELEN C. RODGERS,

10 comprising a base provided with a bed upon G. Y. THORPE.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of l'atents,

Washington, D. 0." 

